I realize that this is an argument from silence, but nevertheless looking at Sor Op 31:20 and the educational benefits of it, pertaining to stacked chordal structure of this "etude" or study,I was inspired to wonder what would Sor have done in his day if he had also had midi file to set up solos and then write out chordal accompaniment for those solo's . My point being as I interpret the intention behind this particular study is to get used to chordal shapes, as in "chord charts".In his method, Sor discusses the difficulties of chordal nomenclature. Nevertheless studios do use them in getting the job done.
In applying what I believe to be a reasonable assumption. what a joy to be able to accompany a midi creation of Bach's BWV 998 Prelude and Fugue with the implied chords as I interpret them,(starting very slowly of course). I have by no means discovered a diamond,(done before) but just playing along sometimes in support of the solo, to me is what music is really all about. Forever your student in music, that's me. Thank goodness for the cg, and the latest technology in our growth toward achieving goals no matter how slow.